TweetFollow Us on Twitter

Feb 90 Mousehole
Volume Number:6
Issue Number:2
Column Tag:Mousehole Report

SE/II Emulator

By Larry Nedry, Contributing Editor

From: Skaros

Re: Emulate an SE or a II?

Well, now that the 68030 seems to be becoming the standard cpu for the Mac what happens to all the software written for the other machines(Plus,SE,II) that won’t run on a 68030 machine. Well, if you paid buck$ then chances are your software is being upgraded and you can always buy the next version that is MacIIx compatible etc. But, isn’t there someone out there who knows how to write an emulator that would run on a CX and let you use all your favorite software that so far only works on a II or SE, for example, Dark Castle, Arkanoid, or Continuum. If SoftPC can write an app that lets you have an IBM XT equivalent in a window, what do I have to do to write something that lets me use my old programs. What do I have to patch to make it work. After all, the 68030 is a 16 MHz machine; an 8 MHz emulator should be a cinch. Although I’ve written a few small apps for myself, I don’t know enough about the Mac to do this. I’ve a hunch it’s even underneath knowing the toolbox--busses,wait states, and a whole lot of other stuff that I have little experience with. Can anyone shed a little light on the matter?

From: Frankh

Re: Emulate an SE or a II?

A probable source of incompatibility is the screen. Many old Mac games wrote directly to the screen, bypassing the Toolbox. Other headache sources may be software timing loops, and code that depends on certain hardware features of the older machines. I guess that with some work, you could set aside some ram to simulate the screen buffer and then send it to a video card, or intercept all calls to what used to be the screen buffer address. You could make all these patches, and sho’nuff, you’ll end up with a fast B&W Mac 512 (or 128K!) clone running on a CX.

Or...you can call up the companies in question and ask them when they’re coming out with a version that works on the newer machines.

From: Skaros

Re: Emulate an SE or a II?

You’re probably right because when I make the SE30 the main screen the game, oids, doesn’t run, but when the Rasterops driven Apple monitor is the main screen it runs in a half baked way - only using the upper half of the screen for the game. I can only get oids to do this when I’ve booted from sys4.2 When I’ve booted from 6.03, the game is “smart” enough to tell me it can only run on a II or an SE. I wonder what screen specific changes exist between the two Systems?

From: Apage

Re: Emulate an SE or a II

Some applications use self modifying code in order to boost performance. When the II first came out with the 68020 it causes problems with the instruction cache. When the code was modified the modified instruction was already in the cache and so the modification that was expected to take place wasn’t there and thus many programs bombed. The 68030 also has a data cache, so the problems with self modifying programs now reach deeper. There is an assembly language instruction (MOVECR (move to control register)) in the 020/030 instruction set. Use this to turn off the caches and see if that gets your programs running.

From: Skaros

Re: Emulate an SE or a II

Well I tried turning off the cache with a great Init called cache control by J.Hamilton. It doesn’t work. BUT, I got it to work using system 4.2!! But when I run the program it only uses half a screen at a time and then runs using the upper half of the screen. Interestingly this is a 256 color game named oids and I’m using a rasterops card with an Apple color monitor hooked to an SE30. The program doesn’t run when I make the Mac the main screen. Probably has to do with the way the game addresses the screen buffer. But, why should it be smart enough to say it can’t run when I’ve booted with sys6.03 but it goes ahead and runs crazy when I’ve booted with sys 4.2?

From: Frankh

Re: CRC code

I’m looking for a fast CRC generator (in Pascal, preferably). I translated some C code, but it was not all that fast...Any code (C or assembly would be OK too) would be appreciated.

From: Larry Nedry

Re: CRC code

Don’t use a CRC generator. Use a lookup table. MUCH FASTER!

There is a very good book on serial communications called “C Programmers Guide to Serial Communications” by Joe Cambell. It has everything you’ve every wanted to know about CRC’s.

From: Infosyn

Re: OOP, Think Pascal

Is there anyone else out there writing OOP stuff with Think Pascal? Have you also run into the problem of a method not being in memory when you call it? Symantec says the manual warns that it’s up to the programmer to make sure the requisite segment has been loaded, so I’ve been loading ‘em all at launch time. But with 300K of CODE in 36 units in 12 segments, it hurts! Anybody figured out a better way?

From: Chenette

Re: OOP, Think Pascal

I’ve had trouble with dangling or missing handles causing the method not found error. Are you trying to dereference any nil handles?

From: Infosyn

Re: OOP, Think Pascal

I wish it were that easy. Unfortunately this is a serious design flaw in Think Pascal. Normally all globally referenced routines have addresses in the application’s jump table, so the Segment Manager “automatically” ensures that the respective segment is in memory before you call it. But with a method, there’s no such guarantee. And LSP does not have any internal way to keep track of which segment each method is in, so it’s currently entirely up to the programmer to make sure that the correct segments are in memory. (At least that’s the way Symantec describes it.)

But there are evidently other factors at work here, and I was hoping someone had discovered an easy work-around. For example, “sometimes” you can avoid the address error crash by moving the *declaration (not the definition) of the method to a different segment. This part is unclear to me (as you can tell.) Symantec is fully aware of the situation and is almost willing to say they are working on it, I guess. I was hoping someone else knew the straight scoop on this.

From: Siegel

Re: OOP, Think Pascal

The important thing to remember is that the object declaration must be in a segment which is loaded and which stays loaded. The best segment for this purpose is the main segment.

It’s OK to have object declarations in one file and method bodies in another; in fact, it’s much more flexible that way.

From: Siegel

Re: OOP, Think Pascal

By way of clearing up some confusion, let me explain:

The problem you describe is more a drawback of the object pascal architecture than it is a bug in THINK Pascal. In every program, ALL globally referenced routines do have entries in the jump table, but methods are a special case; they’re referenced by means of a class info proc, which is generated when a class of object is declared. In this sense, they’re not globally referenced, which explains why (for example) you can’t take the address of a method as a callback for a Toolbox routine.

The Class Info Proc needs to be in a segment which is initially loaded, and which stays in one place while those methods are used. The best way to ensure this is to have the class declarations in a file which is kept in the main segment, and have the class’s method bodies in another unit which can be placed in any segment; there’s no need for the method bodies themselves to be loaded, only the class declaration.

It is up to the programmer to ensure that the class declaration’s segment is in memory, and the simplest way to do so is to place the class declarations in the main segment, which is never unloaded and which is loaded at launch time.

Rich Siegel, Symantec.

From: Walrus

Re: REAL PROGRAMMERS materialFrom: Fling

Re: Getting APPL’s WDID

Does anybody know a fast, simple method of obtaining the application’s working directory ID. I need to open a companion help file, which should be located in the same directory as the launched application.

From: Mrteague

Re: Getting APPL’s WDID

It’s quite simple - do a GetVol call when you start the application - it will return you the volume name, and the volume refNum, which will be a WDRefNum when you are in a directory (which is set before the Launch trap when launching the application).

From: Siegel

Re: Getting APPL’s WDID

The cheapest way to do this is to open your associated file using a value of 0 as the “vRefNum”, since that specifies the default. The PMSP will then look in the same folder as the application, and if that fails, it’ll look in the system folder.

From: Mrteague

Re: Getting APPL’s WDID

I would add one warning to that method - if you do anything that changes the default directory (like maybe after a SFGetFile/SFPutFile call), then a vRefNum of 0 will give you the *current* default directory, which may *NOT* be the same one that the application originally started with, in case the distinction is important (like Config files etc).

From: Zweig

Re: Think C 4.0 DA Class

Does anyone know where I can find a desk accessory class for Think C 4.0. It looks like they want to support it since there’s an OOPS.A4 library, but I don’t see any clean way to override the menu bartender class or the swictchboard class to handle the DA events. If anyone knows someone who’s done it, please let me know. Thanks.

From: Siegel

Re: Think C 4.0 DA Class

The TCL was not intended for writing DA’s; Code Resources, drivers, and DA’s can be written using Object C, but you’ll pretty much have to roll your own classes.

From: Jumpcut

Re: TCL & List manager?

On the slim chance that somebody may have done my work for me, I was wondering if anyone has a class for a list window under TCL, i.e. a subclass of CDirector and/or CWindow that handles one-column lists. I don’t want to use CDocument, as there is no file connected with this list in any normal manner. Has anybody done this, and would like my eternal thanks and gratitude or do I have to dig in and learn this stuff? Does anyone, in fact, use the Think Class Library other than me? Are there organizations to help us rehabilitate?

From: Apage

Re: TCL & List manager?

I’m working on a subclass of CPane that might be able to help. It would enable you not only to specify objects in the list, and have them returned as objects upon selections, but by use of a superclass I’m defining with it you can alter the behavior of each list item by overriding some default methods. For instance, in the case of a directory in a list of files it would open as soon as you selected it, or appear in a different color to separate it from file entries. However, be advised that I am not looking to give this code away free.

From: Jumpcut

Re: TCL & List manager?

Thanks, but I got my CListPane working. Or nearly working. It creates a list, but it has problems resizing it (it only resizes properly about half the time). I just buckled down and really learned the darn class library. Now it feels great knowing how the thing works, but what really stinks is that I have dreams about it. THAT’s scary. What so you tell your friends? “All my dreams lately have been object-oriented.” They just think I’ve been cloistered with my Mac for too long now...

Another TCL thing: the printing methods work, but only when I set the partition to about 800K. Otherwise I get a “Mac OS error ID -108” which is out of memory. Any ideas? I would like this app to run on any Mac.

From: Jumpcut

Re: PICT resources in dialogs

I use pretty PICTs in my dialog boxes with no problems. I can’t remember if I had to send to the front or back, but I know that they are the highest number in the DITL (whether that’s front or back, I can’t remember.) All of the other items, buttons, editText, etc. are lower numbers. And it works fine for me.

Try making the PICT the highest number. Related note: Adobe Typeface Manager will intercept the drawing of your PICTs if they’re not just bitmaps, like if you created them in MacDraw, so it can really screw up whatever meticulous arrangement you may have spent hours working on in ResEdit. Some days it doesn’t pay to be a perfectionist.

From: Wesm

Re: Compiling MacApp & Error 405

I’m having a hard time with the Pascal compiler with MPW. I just purchased MacApp, and haven’t been able to successfully compile any of the sample programs. Invariably, the compiler aborts with error 405, “Error opening include file”. The file it chokes on is typically {PInterfaces}Types.p or Quickdraw.p. The shell variables seem to be set up correctly. Does anyone out there in MacAppLand know what’s going wrong?

From: Maniac

Re: Compiling MacApp & Error 405

I had a problem w/ MacApp that I solved by increasing the memory for MPW to 2meg. I made a copy of MPW first in another folder w/ the ‘essential’ files and then increased its size. That way, I can run the default or the big memory version as needed. --Mark

From: Dhands

Re: MacApp and Commands

I can’t subclass any of the commands defined in the file UMacApp.TApplication.p (i.e. TNewDocCommand). I get a compile time error that TNewDocCommand is undefined. The unit USES UMacApp and has no trouble finding other standard MacApp commands. How can I include in my unit the commands defined in UMacApp.TApplication.p?

From: Rastamon

Re: MacApp and Commands

The reason you can’t OVERRIDE commands such as TNewDocCommand, is that those objects are defined in the IMPLEMENTATION section of the code (ie.UMacApp.TApplication.p), rather than in the INTERFACE section (ie. UMacapp.p).

You really don’t need to OVERRIDE these commands, though. What you should *really* do is OVERRIDE the method(s) that gets called by the DoIt method of the command you are interested in. In the case of TNewDocCommand, you can just OVERRIDE TApplication.OpenNew.

From: Spud

Re: BigCursor?

Remember the BigCursor program -- the one that doubled the size of the cursor? Well, it doesn’t seem to work on the Mac II. Does anybody out there in ModemLand know why it wouldn’t work on newer machines (remember, it was released in 1984), and maybe offer a suggestion as to how I could update the program to work with new CPU’s and/or color cursors?

From: Spud

Re: BigCursor?

It doesn’t matter. It bombs in color and B&W. You might say it does not discriminate on the basis of color... Y’know, I even asked Apple’s Developer Tech Sport department, and even THEY didn’t know how to enlarge the cursor! It can’t be THAT hard of a hack, can it???

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Skype 7.5.0.738 - Voice-over-internet ph...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
PushPal 3.0 - Mirror Android notificatio...
PushPal is a client for Pushbullet, which automatically shows you all of your phone's notifications right on your computer. This means you can see who's calling or read text messages even if your... Read more
Logic Pro X 10.1.1 - Music creation and...
Apple Logic Pro X is the most advanced version of Logic ever. Sophisticated new tools for professional songwriting, editing, and mixing are built around a modern interface that's designed to get... Read more
VLC Media Player 2.2.0 - Popular multime...
VLC Media Player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, MP3, OGG, ...) as well as DVDs, VCDs, and various streaming protocols. It... Read more
Sound Studio 4.7.8 - Robust audio record...
Sound Studio lets you easily record and professionally edit audio on your Mac. Easily rip vinyls and digitize cassette tapes, or record lectures and voice memos. Prepare for live shows with live... Read more
LibreOffice 4.4.1.2 - Free, open-source...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
VueScan 9.5.03 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Freeway Pro 7.0.3 - Drag-and-drop Web de...
Freeway Pro lets you build websites with speed and precision... without writing a line of code! With its user-oriented drag-and-drop interface, Freeway Pro helps you piece together the website of... Read more
Cloud 3.3.0 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more
Cyberduck 4.6.5 - FTP and SFTP browser....
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more

The first ever action 3D card battler Al...
On the other hand, you probably haven’t played an action 3D card battler – until now. Step forward, All Star Legion. All Star Legion is a 3D QTE-based action RPG card battler, but fear not – the game itself isn’t as convoluted as its description.... | Read more »
Travel Back to the 1980s With the Making...
Headup Games has released a hilarious making of video for its upcoming title, Pixel Heroes: Byte & Magic. The game is a RPG/Roguelike where you control three heroes set to save the township of Pixton from an evil cult called The Sons of Dawn.... | Read more »
Heavenstrike Rivals Review
Heavenstrike Rivals Review By Campbell Bird on March 2nd, 2015 Our Rating: :: HEAVENLY STRATEGICUniversal App - Designed for iPhone and iPad Despite a few flaws, this free-to-play strategy game is a fun mix of new and old strategy... | Read more »
Get The Whole Story – Lone Wolf Complete...
Get The Whole Story – Lone Wolf Complete is Now Available and On Sale Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Who Wore it Best? The Counting Dead vs....
Like it or not, the “clicker” genre, popularized by cute distractions like Candy Box and Cookie Clicker, seems like it’s here to stay. So Who Wore it Best? takes a look at two recent examples: The Counting Dead and AdVenture Capitalist. | Read more »
Card Crawl, the Mini Deck Building Game,...
Card Crawl, the Mini Deck Building Game, is Coming Soon Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Tinytouchtales and Mexer have announced their new game, | Read more »
Witness an all new puzzle mechanic in Bl...
Well, BlastBall MAX is not one of those games and is bucking trends such as timers, elements of randomness, and tacked-on mechanics in favor of pure puzzle gameplay. When you first boot up the game you’ll see a grid made up of squares that are each... | Read more »
This Princess Has a Dragon and She isn’t...
This Princess Has a Dragon and She isn’t Afraid to Useit. | Read more »
Mecha Showdown Review
Mecha Showdown Review By Lee Hamlet on February 27th, 2015 Our Rating: :: IN A SPINUniversal App - Designed for iPhone and iPad Mecha Showdown replaces traditional buttons with a slot machine mechanic in this robot fighting game,... | Read more »
Reliance Games and Dreamworks Unveil Rea...
Reliance Games and Dreamworks Unveil Real Steel Champions Posted by Ellis Spice on February 27th, 2015 [ permalink ] Reliance Games and Dreamworks have announced that a third game in | Read more »

Price Scanner via MacPrices.net

27-inch 3.5GHz 5K iMac in stock today and on...
 B&H Photo has the 27″ 3.5GHz 5K iMac in stock today and on sale for $2299 including free shipping plus NY sales tax only. Their price is $200 off MSRP, and it’s the lowest price available for... Read more
Apple Launches Free Web-Based Pages and Other...
Apple’s new Web-only access to iWork productivity apps is a free level of iCloud service available to anyone, including people who don’t own or use Apple devices. The service includes access to Apple... Read more
Survey Reveals Solid State Disk (SSD) Technol...
In a recent SSD technology use survey, Kroll Ontrack, a firm specializing in data recovery, found that while nearly 90 percent of respondents leverage the performance and reliability benefits of SSD... Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store is offering Apple Certified Refurbished Mac Pros for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
Updated Mac Price Trackers
We’ve updated our Mac Price Trackers with the latest information on prices, bundles, and availability on systems from Apple’s authorized internet/catalog resellers: - 15″ MacBook Pros - 13″ MacBook... Read more
Apple CEO Tim Cook to Deliver 2015 George Was...
Apple CEO Tim Cook will deliver the George Washington University’s Commencement address to GWU grads on May 17, at which time he will also be awarded an honorary doctorate of public service from the... Read more
Apple restocks refurbished Mac minis for up t...
The Apple Store has restocked Apple Certified Refurbished 2014 Mac minis, with models available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz... Read more
Save up to $50 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $50 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549 $50 off - 128GB iPad Air 2... Read more
16GB iPad Air 2 on sale for $447, save $52
Walmart has the 16GB iPad Air 2 WiFi on sale for $446.99 on their online store for a limited time. Choose free shipping or free local store pickup (if available). Sale price for online orders only,... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1029 $70 off - 21″ 2.7GHz iMac: $1199 $100 off - 21″ 2.9GHz... Read more

Jobs Board

Sr. Technical Services Consultant, *Apple*...
**Job Summary** Apple Professional Services (APS) has an opening for a senior technical position that contributes to Apple 's efforts for strategic and transactional Read more
Event Director, *Apple* Retail Marketing -...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global engagement strategy and team. Delivering an overarching brand Read more
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.